Food and Drug Administration Commissioner Scott Gottlieb called out Walgreens Boots Alliance Inc.'s pharmacy stores as the "top violator" among pharmacies illegally selling tobacco products to minors, and has sent a letter to management requesting a meeting. Gottlieb said in all, 15 national retail chains have been identified with "disturbingly high rates of violations," including Dow Jones Industrial Average components Exxon Mobil Corp. , Chevron Corp. and Walmart Inc. ,as well as Kroger Co. , Marathon Oil Corp. , Sunoco L.P. and Casey's General Stores Inc. . "Companies should be on notice that the FDA is considering additional enforcement avenues to address high rates of violations," Gottlieb said in a statement. He said the FDA has also sent letter to more than 40 companies seeking information about more than 50 products, including e-cigarette products, that are being illegally marketed, citing concerns that these companies are attempting to capitalize on the "troubling popularity" of Juul Labs Inc.'s e-cigarettes. In December, Altria Group Inc. announced a $12.8 billion equity investment in Juul.